EPA Core Questions Flashcards
(25 cards)
Ozone depletion is caused by ________ in HCFC refrigerants?
A. Fluorine
B. Chlorine
C. Carbon
D. Hydrogen
B. Chlorine
CFCs and HCFCs _____________ making them capable of reaching the stratospheric ozone layer.
A. Do not dissolve in water or easily break down in the atmosphere
B. Are lighter than other chlorine compounds
C. Jet upward when released
D. Are attracted to ultraviolet radiation
A. Do not dissolve in water or easily break down in the atmosphere
According to the Roland-Molina theory, ____________ are destroyed by each chlorine atom in the stratosphere.
A. 200 ozone molecules
B. 100,000 ozone molecules
C. 110 ozone molecules
D. 25200 ozone molecules
B. 100,000 ozone molecules
The stratospheric ozone layer protects us from ______________.
A. Infrared radiation from space
B. Alpha radiation from space
C. Ultraviolet radiation from the sun
D. Gamma rays
C. Ultraviolet radiation from the sun D
Which health effect increases from loss of the stratospheric ozone layer?
A. Cases of cataracts and skin cancer
B. Cases of heart attacks
C. Increased respiratory issues
D. Thyroid disorders
A. Cases of cataracts and skin cancer B
Which of the following proves that HCFCs are in the stratosphere?
A. Scientists with extensive laboratory testing
B. Measurement of ozone at ground level
C. HCFCs found in air samples from the stratosphere
D. Satellite measurements of light passing through the atmosphere
C. HCFCs found in air samples from the stratosphere
What makes HFC refrigerants damaging to the environment?
- They contain fluorine, which damages the ozone layer
B. They contain chlorine, which damages the ozone layer.
C. They have a high ozone depletion potential (ODP)
D. They can have very high global warming potentials
D. They can have very high global warming potentials
___________ make(s) HFO refrigerants less flammable than HC refrigerants
A. Chlorine
B. Fhosgene
C. Fluorine
D. Fractured oxygen (FO)
C. Fluorine
Which refrigerant contains chlorine?
A. R-12
B. R-1234yf
C. R-134a
D. None of them
A. R-12
HFO refrigerants are miscible in _______ lubricants
A. All
B. POE lubricants
C. Mineral oils
D. Alkylbenzene (AB) oil
B. POE lubricants
An example of an HCFC refrigerant is:
A. R-407c
B. R-123
C. R-134a
D. R-404A
B. R-123
What is being done isn’t he US to stop damage to the stratospheric ozone layer?
A. Using coal instead of nuclear power to product electricity
B. Eliminating the use of CFCs and HCFCs refrigerants
C. Enforcing strict emission requirements on two-cycle engines
D. All of the above
B. Eliminating the use of CFCs and HCFCs refrigerants
EPA regulations require appliances to have _________
A. A service aperture or process stub
B. Purge valves or purge units
C. King valves
D. Oversized filter driers
A. A service aperture or process stub B
The release of any CFC, HCFC, or HFC refrigerant during ____________ is illegal
A. The installation of manifold gauges equipped with low-loss fittings
B. Theft of equipment
C. The connection of a recovery machine equipped with low-loss fittings
D. All of the above
B. Theft of equipment
________ is the only EPA SNAP approved “drop-in” replacement for R-22.
A. R-407C
B. R-1234yf
C. Propane (R-290)
D. There are no direct drop-in refrigerant substitutes
D. There are no direct drop-in refrigerant substitutes
Ester-based oils like POE can be mixed with _________.
a. PAG and mineral oils
B. Paraffin is mineral oils
C. Alkylbenzene oils
D. No other oils
D. No other oils
What provides the cooling in a vapor compression refrigeration system?
A. The refrigerant turning into a liquid
B. The compression of the refrigerant vapor
C. The vaporization of the liquid refrigerant
D. The condensation of the refrigerant as it gives off heat in the condenser
C. The vaporization of the liquid refrigerant
An oil sample might be taken when ___________.
A. Moisture and/or acid problems are suspected
B. Oil sludge formation or oil waxing is suspected
C. Residual acidic oil from a burn-out is suspected of contaminating the replacement oil
D. All of the above
D. All of the above
____________ returns refrigerant to new product specifications and requires chemical analysis to verify the purity to AHRI-700 standards.
A. Recovering
B. Recycling
C. Reclaiming
D. Restoring
C. Reclaiming
The EPA considers _________ the most effective for locating the general area of a small leak
A. Deep vacuum test
B. Electronic or ultrasonic tester
C. Halide torch
D. Audible sound
B. Electronic or ultrasonic tester
Low ambient temperatures __________ recovery time
A. Decreases
B. Increase
C. Have no effect on
D. Saturate
B. Increase
A system is considered dehydrated when _______________
A. A micron gauge shows you have reached and held a vacuum of 500 microns or less with the vacuum pump isolated from the system
B. A micron gauge shows you can maintain a vacuum of at least 500 microns, for at least five minutes, while the vacuum pump is operating.
C. The manifold suction gauge is bottomed out at 29.9 IN.HG for at least an hour
D. The vacuum pump sound is indicating that nothing else is being pumped out. 
A. A micron gauge shows you have reached and held a vacuum of 500 µm or less with the vacuum pump is isolated from the system. 
If corrosion is discovered in the body of a relief valve, the valve must be_________.
A. Lubricated
B. Wire brushed and painted
C. Soaked in alcohol for at least 16 hours
D. Replaced
D. Replaced
The fill level of a recovery cylinder can be determined by ___________.
A. Mechanical float or electronic shut off devices.
B. The weight of the cylinder.
C. Shaking the cylinder to determine if there is liquid inside.
D. Both A and B
D. Both A and B
